By George Hart for the Museum of Mathematics
Here is a set of laser-cut Truchet tiles with circular arcs, designed to be rearranged in a frame. The top layer parts with the quarter-circle arcs are glued to the squares of the bottom layer. The rule when assembling the tiles is to match high to high and low to low.
With just these two types of pieces, you can make a variety of patterns ranging from only circular islands to only circular lakes, with many possible landscapes in-between. Because the surface is raised, you can make rubbings with a pencil or crayon to save your favorites to paper.
See all of George Hart’s Math Monday columns
I hate security screws with a passion. When I become president I’m going to push to make them illegal. But in the meantime, what happens if you come across some that need to be dealt with? You get this 54 Piece Bit Driver Kit from the Maker Shed and get to work! The kit includes plenty of security bits to ensure you can open almost anything. The magnetized driver features a metal shaft, swivel top, rubberized grip, and a 60mm extension. It also includes a flexible 130 mm extension for those hard to reach areas. The entire kit comes packaged in a handy-dandy reusable plastic case.
Includes the following bit types:
- Slot sizes 1, 1.3, 1.5, 2, 2.5, 3, 3.5, 4 mm
- Philips sizes #000, #00, #0, #1 (x2), #2
- Spanner sizes 2, 2.2, 2.6, 3 mm
- Torx sizes T3, T4 (x2), T5, T6 (x2), T7, T8, T9, T10, T15, T20
- Hex sizes 0.7, 0.9, 1.3, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 6 mm
- Posidrive sizes #0, #1, #2
- Star sizes 2, 3 mm
- Square sizes #0, #1, #2
- Triangle size 3 mm
- Tri-wing sizes #0, #1
- Drop size 1 mm